Mix together salt, sugar, lemon zest, thyme, and pepper. Add gin. The mixture should resemble wet sand.
Rub salmon fillets with the cure, using approximately 1 tablespoon for every 8 ounces of fish.
Wrap fillets tightly in plastic wrap and refrigerate for 1 to 2 hours.
Preheat oven to 225 degrees F.
To prepare for cooking, rinse off fish and pat dry with paper towel.
Rub lightly with a high-quality neutral oil, such as rice bran or grape seed oil.
Bake for 25-30 minutes.
Begin to check fish at about 20 minutes. Be careful to not overcook (i.e., the fish should not be leaching white proteins).
Serve immediately when done!
Notes:The finished dish is best enjoyed immediately, but the rubbed fillets may optionally be stored in the refrigerator for up to a day before cooking. The rub can be stored in an airtight container in the fridge for at least one week, and it also works great on grilled lamb chops!